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| 型號： | MHF283R3S |
| 廠商： | Standard Power |
| 英文描述： | DC/DC CONVERTERS 28 VOLT INPUT |
| 中文描述： | DC / DC轉(zhuǎn)換28伏的輸入 |
| 文件頁數(shù)： | 13/21頁 |
| 文件大?。?/td> | 291K |
| 代理商： | MHF283R3S |
1
Size (max.): Non flanged, case E2, 1.460 x 1.130 x 0.330 inches (37.08 x 28.70 x 8.38 mm)
Flanged , case G2, 2.005 x 1.130 x 0.330 inches (50.93 x 28.70 x 8.38 mm)
See Figures 13 - 16 for dimensions.
Weight:
32 grams maximum.
Screening: Standard, ES, or 883 (Class H). See Table 1 for screening options.
DESCRIPTION
Interpoint’s MHF+ Series Triple DC/DC converters provide a wide
input voltage range of 16 to 48 VDC delivering 15 watts of total
output power with output voltages of +5 and ±12 or +5 and ±15
VDC. The main output, +5 VDC, will supply up to 7.5 watts and the
auxiliaries will supply up to 7.5 watts of combined power. Full power
operation at -55° C to +125°C plus the ability to withstand transients
of up to 80 V for up to 120 milliseconds make these converters an
ideal choice for your high reliability systems.
C
ONVERTER
D
ESIGN
MHF+ Triple Series of DC/DC converters incorporate dual-phase,
phase-shifted technology with a continuous flyback topology. This
design eliminates a minimum load requirement on the main output
and eliminates cross regulation effects between the main output
voltage and the auxiliary output voltages. The phase-shifted design
offers a further benefit in reduced input and output ripple.
I
NHIBIT
F
UNCTION
An open collector, TTL compatible, inhibit terminal (pin 1) provides
shut-down and start-up control. Applying a logic level low (<0.8 V),
referenced to input common, will disable the output of the converter.
When inhibited input current is reduced to 5 mA or less and there is
no generation of switching noise. The inhibit terminal typically sinks
3 mA when the converter is inhibited.
Leaving the terminal open or pulling it high will enable the converter.
Use an open collector interface for logic high voltages of up to 11
volts. (Refer to Figure 2 for a connection diagram.) An open collector
interface is not required if the logic high is in excess of the open
circuit voltage of the inhibit terminal, 11 volts, but less than 40 volts.
S
OFT
S
TART
F
EATURE
The soft-start feature provides a controlled 20 milliseconds turn-on
to minimize inrush current and reduce overshoot at initial start-up or
when inhibit is released.
S
YNCHRONIZATION
To synchronize the converter’s switching frequency to a system
clock apply the clock signal to the sync terminal (pin 7). When
multiple converters are powered from a single power source, asyn-
chronous (free run) operation will result in lower peak noise for
common spectral peaks, but synchronous operation will eliminate
any possibility of interference frequencies in the low audio band.
Source impedance of the signal should be less than 100 ohms and
the transition time should be less than 100 nanoseconds. The
capacitively coupled sync input will synchronize on a differential
signal of as low as 4 volts to as high as 10 volts. If the sync function
is not used, the terminal should be left open.
S
HORT
C
IRCUIT
P
ROTECTION
Internal current limiting circuitry protects all three outputs against
short circuits. When output power exceeds approximately 130% of
maximum output power, the output currents are limited. In addition,
separate current limiting circuitry protects each output individually
resulting in normal operation of either the main or the auxiliaries,
whichever is not in a shorted condition.
P
ACKAGING
MHF+ Triple converters are packaged in hermetically sealed metal
cases. MHF+ Triple converters can be purchased in a flanged or
non-flanged case. The flanged option provides increased heat dissi-
pation and also provides greater stability when mechanically
secured.
DC/DC C
ONVERTERS
28 V
OLT
I
NPUT
MHF+ SERIES TRIPLE
15 WATT
F
EATURES
–55° to +125°C operation
16 to 48 VDC input
Fully Isolated
Optocoupler feedback
Fixed frequency 450 kHz
Topology – Current Mode Flyback
Transient protection 80 V/120 ms
Inhibit and sync functions
Indefinite short circuit protection
Undervoltage lockout
Up to 76% efficiency
MODELS
VDC O
UTPUT
TRIPLE OUTPUT
+5 and ±12
+5 and ±15
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